Self-adjusting tail heating surface anti-abrasion structure
Through the self-adjusted anti-wear structure of the tail heat receiving surface, the flue gas flow equalization and flow rate adjustment is achieved by using the flow guide and deformation support rod, which solves the problem of poor effects of traditional devices, improves the anti-wear effect and service life of the boiler tail heat receiving surface, and is convenient for maintenance.
Patent Information
- Application Number
- CN202510389554.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-07-11
AI Technical Summary
The traditional boiler tail heated surface anti-wear device has poor effect and is inflexible to use, so it cannot effectively deal with the wear problem caused by uneven flue gas distribution.
A self-adjusted anti-wear structure of the tail heat receiving surface is designed, including a flow guide, a flow guide wing plate and a deformation support rod. The flue gas flow is achieved through the flow guide channel, and the flue gas flow rate is automatically adjusted at high temperatures. The deformation support rod is composed of materials with different thermal expansion coefficients to maintain the stability of the flow guide channel.
It effectively reduces the wear of the pipe bundle of the heated surface by the flue gas, improves the stability and service life of the heated surface at the tail of the boiler, and facilitates disassembly and assembly and maintenance.
Smart Images
Figure CN120292497A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of boiler heating surface protection, and particularly relates to a self-adjusting anti-abrasion structure for the tail heating surface. Background Art
[0002] Power station boilers have a relatively long service life. After the power generation unit is built, it often needs to operate for several decades. With the continuous operation of the boiler unit, problems such as reduced combustion system efficiency and uneven burning occur, and problems such as ash accumulation and coking will occur on the furnace water wall, row-type heating surface, and horizontal flue heating surface. The power station boiler runs continuously for a long time each time, generally shutting down only once a year, and sometimes running continuously for more than a year. The ash accumulation and coking problems of the boiler heating surface cannot be processed in time. The tail heating surface of the boiler mainly refers to the heating surface components arranged in the rear flue of the boiler. The decrease in the heat absorption efficiency of the boiler heating surface will cause an increase in the flue gas volume of the boiler tail heating surface. The uneven distribution of the flue gas entering the tail heating surface will cause serious wear on local positions of the tail heating surface.
[0003] The traditional way to solve the wear of the tail heating surface is to install a guard plate. However, the protection area of a single guard plate is small, and it can only protect local important parts. As mentioned above, the uneven distribution of the flue gas entering the tail heating surface will also cause wear of the heating surface. When the flue gas enters from the tail heating surface, it first passes through the suspension pipe, then deflects downward and backward around the suspension pipe, and then enters the tail heating surface. Usually, it will scour the first three rows of heating surface tubes in the tail, and then leave the tail heating surface after passing through the tail heating surface. In the suspension pipe area, it will scour the suspension pipe downward. Due to the sudden change of the flue gas cross-section, local vacuum and turbulence are formed in the heating surface area and the suspension pipe area of the last three rows from the bottom of the tail heating surface where the flue gas exits, thus scouring the suspension pipe and the area of the lower three rows of pipes. Long-term scouring will also cause wear of the heating surface. Although the existing protection devices also have a flow equalization design for the flue gas inlet and outlet, they have the defects of complex structure and inability to be flexibly used in the complex flue gas environment. Summary of the Invention
[0004] The purpose of the present invention is to provide a self-adjusting anti-abrasion structure for the tail heating surface to solve the problems of poor effect and inflexible use of the above-mentioned traditional anti-abrasion devices, which has the advantages of equalizing the flow of flue gas, being able to timely expand the flue gas flow rate when encountering high-temperature flue gas, good anti-abrasion effect, and being convenient for disassembly and assembly.
[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:
[0006] A self-adjusting anti-abrasion structure for the tail heating surface, comprising a suspension tube and a heating surface tube bundle. The heating surface tube bundle is fixed on the suspension tube through a mounting member. It further includes an outer anti-abrasion guard plate and an inner anti-abrasion guard plate. The outer anti-abrasion guard plate is installed on the heating surface tube bundle, and the inner anti-abrasion guard plate is fixed outside the mounting member. A diversion seat is installed at the top of the inner anti-abrasion guard plate, and a diversion wing plate is installed at the top of the outer anti-abrasion guard plate. A diversion channel is formed between the diversion seat and the diversion wing plate. The diversion seat is sleeved on the outer wall of the suspension tube. One end of the side wall of the diversion seat is connected to one end of the diversion wing plate through a rotating connecting rod, and the other end of the side wall is connected to the other end of the diversion wing plate through a deformation support rod. The deformation support rod is in a bent shape and can be deformed into a straight rod shape after heating to support the diversion wing plate to move away from the diversion seat to expand the aperture of the diversion channel.
[0007] Preferably, the diversion seat has a frustum-shaped structure, and the distance between the top end of the diversion wing plate and the diversion seat is less than the distance between the bottom end of the diversion wing plate and the diversion seat.
[0008] Preferably, the deformation support rod is composed of a first rod body and a second rod body spliced together. The first rod body and the second rod body are distributed up and down, and the thermal expansion coefficient of the first rod body is greater than that of the second rod body.
[0009] Preferably, a number of through holes for the heating surface tube bundle to pass through are provided on the outer anti-abrasion guard plate. The outer anti-abrasion guard plate and the diversion wing plate are connected through a connecting mechanism. When the diversion wing plate swings, the connecting mechanism pushes the outer anti-abrasion guard plate to move horizontally.
[0010] Preferably, the connecting mechanism includes a first connecting rod provided at the top end of the outer anti-abrasion guard plate and a second connecting rod provided at the bottom end of the diversion wing plate. The first connecting rod and the second connecting rod are rotatably connected through a connecting rod.
[0011] Preferably, a groove is provided on the first connecting rod. One end of the connecting rod is rotatably connected to the inner wall of the groove through a first rotating shaft, and the other end of the connecting rod is rotatably connected to the second connecting rod through a second rotating shaft.
[0012] Preferably, the inner anti-abrasion guard plate includes a rectangular structure formed by symmetrically arranged first guard plates and symmetrically arranged second guard plates. A number of through holes for the heating surface tube bundle are also provided on the first guard plates.
[0013] Preferably, the aperture of the through hole is slightly larger than the outer diameter of the heating surface tube bundle.
[0014] Preferably, the first guard plate is formed by connecting and assembling a number of splicing plates in sequence. The through holes on the first guard plate are formed by splicing semi-circular grooves provided on the splicing plates. The bottoms of the first guard plate and the second guard plate are movably installed with bases.
[0015] Preferably, insertion blocks are provided at the bottoms of the first protective plate and the second protective plate, and slots are provided on the surface of the base. The slots are slightly larger than the insertion blocks. The base is sleeved on the hanging pipe, and a locking washer fixed on the hanging pipe is installed at the bottom. The insertion blocks are inserted into the slots by squeezing the base with the locking washer.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] 1. The tail flue gas can be diverted between the outer anti-abrasion protection plate and the inner anti-abrasion protection plate and to the outside of the outer anti-abrasion protection plate through the diversion channel, realizing the uniform flow of the flue gas. And due to the presence of the inner anti-abrasion protection plate, the installation parts between the hanging pipe and the heating surface tube bundle can be protected, reducing the erosion of the flue gas on the connection part, effectively ensuring the stability of the use of the tail heating surface. The opening angle between the diversion wing plate and the diversion seat is adjustable. Using a deformation support rod, when the temperature rises, it can push the outer anti-abrasion protection plate away from the inner anti-abrasion protection plate, expanding the distance between the two, so that the high-temperature flue gas can flow quickly, avoiding the situation of damaging the heating surface tube bundle caused by long-term high temperature.
[0018] 2. In the present invention, the inner anti-abrasion protection plate adopts an assembled structure, which is convenient to install on the heating surface tube bundle. The inner anti-abrasion protection plate is clamped by a movable base, which is convenient for disassembly, thus facilitating the overhaul and maintenance operation of the tail heating surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of the uniform flow and anti-abrasion device of the present invention.
[0020] Figure 2 It is a schematic top view of the installation between the diversion seat and the diversion wing plate of the present invention.
[0021] Figure 3 It is a schematic diagram of the composition structure of the deformation support rod of the present invention.
[0022] Figure 4 It is a schematic diagram of the structure of the outer anti-abrasion protection plate of the present invention.
[0023] Figure 5 It is a schematic diagram of the connection state of the connection mechanism of the present invention.
[0024] Figure 6 It is a schematic diagram of the split structure of the inner anti-abrasion protection plate of the present invention
[0025] In the figure: 1. Hanging pipe, 2. Heating surface tube bundle, 3. Mounting piece, 4. Flow guide seat, 5. Flow guide wing plate, 6. Rotating connecting rod, 7. Deformation support rod, 8. Connecting mechanism, 9. Outer anti-abrasion guard plate, 10. Inner anti-abrasion guard plate, 11. Base, 12. Locking washer, 13. First rod body, 14. Second rod body, 15. Through hole, 16. First connecting rod, 17. Groove, 18. Link rod, 19. First rotating shaft, 20. Second rotating shaft, 21. Second connecting rod, 22. First guard plate, 23. Second guard plate, 24. Splicing plate, 25. Insert block, 26. Slot, 27. Thread groove. Detailed implementation mode
[0026] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes.
[0027] As Figure 1 shown, a self-adjusting anti-abrasion structure for the tail heating surface is disclosed, which includes a hanging pipe 1 and a heating surface tube bundle 2. The heating surface tube bundle 2 is fixed on the hanging pipe 1 through a mounting piece 3. It also includes an outer anti-abrasion guard plate 9 and an inner anti-abrasion guard plate 10. The outer anti-abrasion guard plate 9 is installed on the heating surface tube bundle 2, and the inner anti-abrasion guard plate 10 is fixed outside the mounting piece 3. Since the hanging pipe 1 and the heating surface tube bundle 2 are installed vertically, a suitable mounting piece 3 is required to install them in a cross shape. An expansion gap is provided between the mounting piece 3 and the hanging pipe 1 and the heating surface tube bundle 2, which can provide the space required for displacement due to expansion when the hanging pipe 1 and the heating surface tube bundle 2 are heated unevenly. The outer anti-abrasion guard plate 9 is used to protect the heating surface tube bundle 2, and the inner anti-abrasion guard plate 10 is used to protect the part where the mounting piece 3 is located, effectively solving the problem of easy abrasion at the connection between the hanging pipe 1 and the heating surface tube bundle 2.
[0028] As Figure 1 and Figure 2 shown, a flow guide seat 4 is installed at the top of the inner anti-abrasion guard plate 10, and a flow guide wing plate 5 is installed at the top of the outer anti-abrasion guard plate 9. A flow guide channel is formed between the flow guide seat 4 and the flow guide wing plate 5. The flow guide seat 4 is sleeved on the outer wall of the hanging pipe 1. One end of the side wall of the flow guide seat 4 is connected to one end of the flow guide wing plate 5 through a rotating connecting rod 6, and the other end of the side wall is connected to the other end of the flow guide wing plate 5 through a deformation support rod 7. The deformation support rod 7 is in a bent shape and is used to deform into a straight rod shape after heating to support the flow guide wing plate 5 to move away from the flow guide seat 4 to expand the aperture of the flow guide channel.
[0029] When the flue gas passes through the tail heating surface, it first contacts the flow guide seat 4 and the flow guide wing plate 5. Since a flow guide channel is formed between the two, the flue gas will be evenly divided into two parts. One part enters the flow guide channel, and the other part continues to flow downward along the outside of the flow guide wing plate 5. In this way, the uneven or turbulent flue gas can be effectively guided through the tail heating surface, reducing the side impact on the hanging pipe 1 and the heating surface tube bundle 2. It can be understood that the flue gas along the outside of the flow guide wing plate 5 will pass through all the heating surface tube bundles 2 and finally flow through the heating surface. The flue gas entering the flow guide channel will enter between the outer anti-wear guard plate 9 and the inner anti-wear guard plate 10 and contact the heating surface tube bundle 2 between the two. The size of the flow guide channel is not fixed but is controlled by the deformation support rod 7 between the flow guide seat 4 and the flow guide wing plate 5. Since the top ends of the flow guide seat 4 and the flow guide wing plate 5 are connected by a rotating connecting rod 6, and the flow guide seat 4 is fixed on the hanging pipe 1 and is in a fixed state, only the flow guide wing plate 5 can swing at the connection of the rotating connecting rod 6. The deformation support rod 7 serves as a limit for the swing. In the initial state, the deformation support rod 7 is in a bent state and can also provide a buffer force for the flow guide wing plate 5. For example, when a large amount of flue gas scours the flow guide wing plate 5, the bent deformation support rod 7 makes the flow guide wing plate 5 elastic. In this way, when being scoured, the elasticity cancels part of the scouring force and can also ensure the service life of the flow guide wing plate 5. When encountering high-temperature flue gas, since the upper surface of the deformation support rod 7 will first contact the flue gas and the temperature of the lower surface is lower than that of the upper surface, due to the temperature difference, the upper surface is prone to expansion. For this reason, the deformation support rod 7 is designed with the center of the bend located above the deformation support rod 7. So when expanding, the upper surface gradually straightens, driving the entire deformation support rod 7 to be pulled into a straight rod, increasing the distance between the flow guide seat 4 and the flow guide wing plate 5, resulting in an increase in the diameter of the flow guide channel between the two. The high-temperature flue gas can quickly pass through the flow guide channel. To ensure that the flue gas can also quickly pass between the outer anti-wear guard plate 9 and the inner anti-wear guard plate 10, the outer anti-wear guard plate 9 is connected to the flow guide wing plate 5. In this way, when the flow guide channel is expanded, the distance between the outer anti-wear guard plate 9 and the inner anti-wear guard plate 10 also increases, thereby also accelerating the passage of the flue gas. After the temperature of the flue gas returns to normal, the deformation support rod 7 also returns to the initial state. In this way, without any kinetic energy, only by using the high-temperature flue gas generated by unexpected situations, the continuous high-temperature corrosion of the heating surface tube bundle 2 can be alleviated.
[0030] To ensure the smoothness of the flue gas flow, the flow guide seat 4 has a frustum-shaped structure. The distance between the top end of the flow guide wing plate 5 and the flow guide seat 4 is smaller than the distance between the bottom end of the flow guide wing plate 5 and the flow guide seat 4. The flue gas resistance received at the top end of the frustum-shaped structure is small, and the inverted trumpet-shaped flow guide channel can also accelerate the passage of the flue gas through the flow guide channel.
[0031] As described above, the deformation support rod 7 is in a bent state under normal conditions and gradually straightens when subjected to high temperatures. This is achieved by utilizing the temperature difference between the upper and lower surfaces. However, in the case of continuous high temperatures, once the high temperatures received by the upper and lower surfaces of the deformation support rod 7 gradually approach equality, it becomes difficult to maintain the straight rod state at this time. Therefore, as Figure 3 shown, the deformation support rod 7 is designed as follows. The deformation support rod 7 is composed of a first rod body 13 and a second rod body 14 spliced together. The first rod body 13 and the second rod body 14 are distributed vertically. The coefficient of thermal expansion of the first rod body 13 is greater than that of the second rod body 14. By assembling two materials with different coefficients of thermal expansion to form a deformation support rod 7, in ordinary low-temperature flue gas, the deformation support rod 7 assembled by the first rod body 13 and the second rod body 14 is still in a bent state. Once the temperature rises, the first rod body 13 with a high coefficient of thermal expansion deforms first, while the second rod body 14 does not deform. By using this method, the bending is straightened. In this way, even in the case of long-term high temperatures, due to the different coefficients of thermal expansion of the rod bodies of the two materials, the straightened state of the deformation support rod 7 can be maintained.
[0032] As Figure 4 and Figure 5 shown, a plurality of through holes 15 for the heat exchange surface tube bundle 2 to pass through are opened on the outer anti-abrasion guard plate 9. The outer anti-abrasion guard plate 9 and the flow guiding wing plate 5 are connected by a connecting mechanism 8. When the flow guiding wing plate 5 swings, the outer anti-abrasion guard plate 9 is pushed to move horizontally through the connecting mechanism 8. In order to be able to fix the outer anti-abrasion guard plate 9 on the heat exchange surface tube bundle 2, through holes 15 need to be opened. Due to the limitation of the through holes 15, the outer anti-abrasion guard plate 9 can only move along the length direction of the heat exchange surface tube bundle 2, that is, horizontally. Also, because the flow guiding wing plate 5 is in a swinging state, the connecting mechanism 8 is required to convert the swinging force into a horizontal pushing and pulling force.
[0033] The connecting mechanism 8 includes a first connecting rod 16 arranged at the top end of the outer anti-abrasion guard plate 9 and a second connecting rod 21 arranged at the bottom end of the flow guiding wing plate 5. The first connecting rod 16 and the second connecting rod 21 are rotatably connected by a connecting rod 18. The connecting rod 18 can convert curvilinear motion into linear motion. Therefore, it is easy to convert the displacement generated by the swing of the flow guiding wing plate 5 into the displacement generated by the horizontal movement of the outer anti-abrasion guard plate 9 by using the connecting rod 18. In order to reduce the gap between the outer anti-abrasion guard plate 9 and the flow guiding wing plate 5, the smaller the gap, the less likely the flue gas is to be disordered. A groove 17 is opened on the first connecting rod 16. One end of the connecting rod 18 is rotatably connected to the inner wall of the groove 17 through a first rotating shaft 19, and the other end of the connecting rod 18 is rotatably connected to the second connecting rod 21 through a second rotating shaft 20. By using the groove 17, the connecting rod 18 can be retracted into the groove 17 in the default state, so that the gap between the first connecting rod 16 and the second connecting rod 21 is small, avoiding the situation that a small part of the flue gas flows into the gap under normal conditions and causes disorder.
[0034] As shown Figure 6 in the figure, the internal anti-abrasion guard plate 10 includes a rectangular structure formed by symmetrically arranged first guard plates 22 and symmetrically arranged second guard plates 23. A number of through holes 15 for the heating surface tube bundle 2 are also provided on the first guard plates 22. In order to ensure the effective protection of the connection between the suspension tube 1 and the heating surface tube bundle 2 by the internal anti-abrasion guard plate 10, an installation member 3 is arranged to be surrounded in a rectangular shape, and the protection effect is good. The through holes 15 here are also for the heating surface tube bundle 2 to pass through. Although the through holes 15 on the external anti-abrasion guard plate 9 can also serve as a guiding function, the through holes 15 of the internal anti-abrasion guard plate 10 are only used for the heating surface tube bundle to pass through. However, in order to provide a redundant design for the thermal expansion of the heating surface tube bundle 2, the diameter of the through hole 15 is slightly larger than the diameter of the heating surface tube bundle 2.
[0035] As shown Figure 6 in the figure, the first guard plate 22 is assembled by connecting a number of splicing plates 24 in sequence. The through holes 15 on the first guard plate 22 are formed by splicing semi-circular grooves opened on the splicing plates 24. The bottoms of the first guard plate 22 and the second guard plate 23 are movably installed on a base 11. In order to facilitate the installation and disassembly of the rectangular internal anti-abrasion guard plate 10, and to facilitate the timely cleaning of the connection between the suspension tube 1 and the heating surface tube bundle 2 and the maintenance and repair operations, the first guard plate 22 is set as an assembled structure. Since there is no heating surface tube bundle 2 passing through the second guard plate 23, there is no need for splicing, and then it is fixed by using the base 11 to form a complete internal anti-abrasion guard plate 10. Insert blocks 25 are provided at the bottoms of the first guard plate 22 and the second guard plate 23, and slots 26 are provided on the surface of the base 11. The slots 26 are slightly larger than the insert blocks 25. The base 11 is sleeved on the suspension tube 1, and a locking washer 12 fixed to the suspension tube 1 at the bottom is installed. By squeezing the base 11 with the locking washer 12, the insert block 25 is inserted into the slot 26. A threaded groove 27 is opened on the suspension tube 1 below the base 11. When the first guard plate 22 is spliced, the insert block 25 of the second guard plate 23 is inserted into the slot 26 of the base 11. As the base 11 moves upward, the slot 26 can also be inserted and combined with the insert block 25 of the first guard plate 22. Finally, the locking washer 12 is screwed to make the flow guide seat 4 and the base 11 clamp the internal anti-abrasion guard plate 10. The slots 26 also have a redundant design, and the flow guide seat 4 is not fixed to the internal anti-abrasion guard plate 10, which is also to provide space for the displacement caused by thermal expansion.
[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0037] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A self-adjusting anti-abrasion structure for the tail heating surface, comprising a suspension pipe (1) and a heating surface tube bundle (2), wherein the heating surface tube bundle (2) is fixed on the suspension pipe (1) through a mounting member (3), and further comprising an outer anti-abrasion guard plate (9) and an inner anti-abrasion guard plate (10), the outer anti-abrasion guard plate (9) is installed on the heating surface tube bundle (2), and the inner anti-abrasion guard plate (10) is fixed on the outside of the mounting member (3), characterized in that, A flow guiding seat (4) is installed at the top of the inner anti-wear guard plate (10), and a flow guiding wing plate (5) is installed at the top of the outer anti-wear guard plate (9). A flow guiding channel is formed between the flow guiding seat (4) and the flow guiding wing plate (5). The flow guiding seat (4) is sleeved on the outer wall of the hanging pipe (1). One end of the side wall of the flow guiding seat (4) is connected to one end of the flow guiding wing plate (5) through a rotating connecting rod (6), and the other end of the side wall is connected to the other end of the flow guiding wing plate (5) through a deformation support rod (7). The deformation support rod (7) is in a bent shape and is used to deform into a straight rod shape after being heated to support the flow guiding wing plate (5) to move away from the flow guiding seat (4) to enlarge the aperture of the flow guiding channel.
2. The self-adjusting anti-wear structure for the tail heating surface according to claim 1, wherein, The flow guiding seat (4) has a frustum-shaped structure, and the distance between the top end of the flow guiding wing plate (5) and the flow guiding seat (4) is less than the distance between the bottom end of the flow guiding wing plate (5) and the flow guiding seat (4).
3. A self-adjusting anti-abrasion structure for the tail heating surface according to claim 1, characterized in that, The deformation support rod (7) is composed of a first rod body (13) and a second rod body (14) spliced together. The first rod body (13) and the second rod body (14) are distributed up and down, and the thermal expansion coefficient of the first rod body (13) is greater than that of the second rod body (14).
4. A self-adjusting anti-abrasion structure for the tail heating surface according to claim 1, wherein, A plurality of through holes (15) for the heating surface tube bundle (2) to pass through are opened on the outer anti-wear guard plate (9). The outer anti-wear guard plate (9) is connected to the flow guiding wing plate (5) through a connecting mechanism (8). When the flow guiding wing plate (5) swings, the connecting mechanism (8) pushes the outer anti-wear guard plate (9) to move horizontally.
5. A self-adjusting anti-abrasion structure for the tail heating surface according to claim 4, characterized in that The connecting mechanism (8) includes a first connecting rod (16) arranged at the top end of the outer anti-wear guard plate (9) and a second connecting rod (21) arranged at the bottom end of the flow guiding wing plate (5). The first connecting rod (16) and the second connecting rod (21) are rotatably connected through a connecting rod (18).
6. The self-adjusting anti-wear structure for the tail heating surface according to claim 5, characterized in that, A groove (17) is opened on the first connecting rod (16). One end of the connecting rod (18) is rotatably connected to the inner wall of the groove (17) through a first rotating shaft (19), and the other end of the connecting rod (18) is rotatably connected to the second connecting rod (21) through a second rotating shaft (20).
7. The self-adjusting anti-abrasion structure for the tail heating surface according to claim 1, characterized in that, The inner anti-wear guard plate (10) includes a rectangular structure formed by symmetrically arranged first guard plates (22) and symmetrically arranged second guard plates (23). A plurality of through holes (15) for the heating surface tube bundle (2) are also opened on the first guard plates (22).
8. A self-adjusting anti-abrasion structure for the tail heating surface according to claim 4 or 7, characterized in that, The aperture of the through hole (15) is slightly larger than the outer diameter of the heating surface tube bundle (2).
9. The self-adjusting anti-abrasion structure for the tail heating surface according to claim 7, characterized in that, The first guard plate (22) is formed by connecting and assembling a plurality of splicing plates (24) in sequence. The through holes (15) on the first guard plate (22) are formed by splicing semi-circular grooves opened on the splicing plates (24). The bottoms of the first guard plate (22) and the second guard plate (23) are movably installed with a base (11).
10. A self-adjusting anti-wear structure for the tail heating surface according to claim 9, characterized in that, Insert blocks (25) are provided at the bottoms of the first guard plate (22) and the second guard plate (23), slots (26) are provided on the surface of the base (11), the slots (26) are slightly larger than the insert blocks (25), the base (11) is sleeved on the hanging pipe (1), and a locking washer (12) fixed to the hanging pipe (1) at the bottom is installed. The insert blocks (25) are inserted into the slots (26) by squeezing the base (11) through the locking washer (12).